Process of manufacturing rubber soles



Apnl 25, 1933. c. R, KElsER PROCESS OF MANUFACTURINGy RUBER SOLES Filed April 25, 1951 INVENTOR (//EEJ l?. YE/55g.

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Patented pr. 25, 129323 CHARLES n.. Knrsnn., or nAY'Ton, OHIO,- Assrsnon 'To mns snaren ansias-R COMPANY,

' or DAYTON, onra'a CORPORATION or Omo` PROCESS or MANUFAGTURENG RUBBER SOLES Application filed Apr1`25,

blanks finished soles one for the right footand the other for the left foot.

lt is a further object of this invention to provide a process of making pairs of soles in assembled condition with an intervening strip of paper between the soles so that they may be easily parted for attachment to shoes.

lt will be understood that shoe soles are provided with a raw gum backing; that is, a vulcanized rubber surface and a raw gum surface. -t is essential to have a protection for the raw gum backing from the air to prevent oxidation because if the raw gum backing is oxidized it will not make a perfeet union with the rubber cement that is used to attach the raw gum side of the rubber sole to a shoe sole. By trimming opposed shoe soles, with their raw gum surfaces adhering to one another, l seal the edges of the soles and exclude the air until the soles are used.

I eliminate the cost of holland cloth or other material heretofore used to cover up the raw gum surfaces. T reduce the handling, and the likelihood of improper packing by placing two left soles or two right soles together, er confusing the sizes.

These and other advantages will appear from the following description taken in connection with the drawing, in which there is shown a preferred embodiment of this invention.

Referring to the drawing:

Figure l is a section of a pair of soles attached to each other, with an intervening strip of paper.

Figure 2 is a top plan view of blanks from. which finished soles are made.

1931. Serial No. 532,817.

Figure 3 is a top .plan view of finished soles.

Figure i shows av card supporting one pair Of soles. Y Figure 5 is a section On the line 5-5 of Figure fi. v Y f This invention relates to the production of shoe soles by pairs from rubber blanks or formsplaced one Vupon the other. y In'Figure l there are shown two blanks l, withvan intervening strip of paper 2 Vbetween the blanks. Toy each blank there is applied a layer of gum 3 or a raw rubberl surface adjacent the strip of paper, for holding the blanks to each other and to the' strip of paper. Y n f This strip of paper may not .extend through the whole length of the blank but may lterminate at a point indicated by the numeral 4. The'purpose of this stripyof paper is to enable the two blanks tofbe easily separated V.one from the other after thetwo blanks thus united have been formed into complete soles.` Two blanks, such as shown in Figure 2, are united face to face with the strip of paper 2 between them.

From these blanks thus'united one` upon the other and held together by means .of the gum 3, nished soles are formed, such as shown in Figure 3. The finished soles mayv be formed by cutting or trimming the edges and forming on the outside faces of the soles, bottoms having diagonally disposed slots therein to produce a wearing surface. The finished sole is indicated by the numeral These soles, after they are finished in groups of pairs, are attachedto cardboards, one pair to eachcard, which is rindicated by the numeral 6.. Any suitable means mayV be used for holding the pairs of soles to thecard, but in the `present instance theyare attached thereto'by means of rivets or brads or clips 7. When it is desired to apply. the soles to' shoes they are removed from thev card and are separated from each other, beginning at the end having therebetween thestrip of paper.J By this ,means the solesare easily supported. M Y

In applying Athe soles tothe soles -ofshoes thersurface of the shoe ysole is thoroughly esy cleaned and thoroughly dried, after which the soles are applied to the soles of the shoes so there is about one-eighth of an inch of space between the outer edges of the rubber sole and the outer edges of the shoe sole to which the rubber sole is applied.

I desire to comprehend within my invention such modifications as may be embraced within my` claims and the scope of my invention'.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. In the process of forming rubber soles, forming a pair of sole blanks, placing the blanks one upon the other and causing them to slightly adhere, and forming the assembled blanks into 'finished soles with each outer surface of the assembled blank form` ing the wearing surface of a sole.

2. In the process of forming` rubber soles, forming a pair of sole blanks and placing one upon the other, and stamping from the assembled blanks a pair of finished soles slightly adhering to eachother along their inner surfaces.

8. In the process of forming shoe soles, forming blanks, placing one blank upon another with a strip of paper between them,

and forming the assembled blanks into finished soles by shaping the edges and faces of the assembly.

4. In the process of forming rubber soles, forming blanks, placing the blanks one upon another with a strip of paper between them, trimming the edges of the assembled blanks to give the assembly the shape of a left sole on one side and the shape of a right sole V on the other side, and stamping the outer surfaces of the assembly to provide wearing surfaces for the soles.

5. In the process of forming rubber soles, forming blanks from which either a right or a left sole may be formed, placing one blank upon another so that each overlies the other, trimming the edges of the assembled blanks to give the assembly the shape of a right'sole on one side and the shape of a left sole on the other side, and forming on the outer surfaces of the assembly wearing surfaces for the soles.

6. In the process of forming rubber soles, forming blanks from which either a right or a left sole may be formed, placing one blank upon another with a strip of paper between them so that each blank overlies the other, shaping the assembled blanks into the form of soles, and forming the outer surfaces of the assembly to provide bearing surfaces for the soles.

7'. In combination, a pair of shoe soles having adhesive faces adjacent one another and in engagement with one another, a strip of material of lesser size than said shoe soles interposed therebetween ext-endingfrom one edge thereof to facilitate the separation of said soles, a supporting card for said soles, and mechanical means passing through said soles adapted to attach them to said card in their face to face position.

8. In combination, a pair of shoe soles having vulcanized rubber surfaces and raw gum surfaces, said raw gum surfaces being` applied to one another, and the edges ofsaid surfaces squeezed together' to exclude air. f

9. In a method of packing shoe soles, placing rubber vulcanized shoe soles with raw gum surfaces with their raw gum surfacesv adhering to one another, pressing to exclude the air from between the surfaces so adhering, and trimming to a predetermined size and by trimming causing the edges of the trimmed soles to closely adhere to exclude the entrance of air.

Y In testimony whereof, I affix my signature.

CHARLES R. KEISER.

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